File content as of revision 0:2e82bfc9dc19:

/*
    Copyright (c) 2011 Jim Thomas, jt@missioncognition.net
 
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
 
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
 
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/

#include "mbed.h"
#include "SDHCFileSystem.h"
#include "EthernetNetIf.h"
#include "HTTPClient.h"
#include "NTPClient.h"
#include "HTTPServer.h"
#include "RPCFunction.h"
#include "RPCVariable.h"
#include "AvailableMemory.h"


#define HOSTNAME "mbedSE"
#define PORT 80

// Setup the SD card file system on the /sd path
SDFileSystem sd(p5, p6, p7, p8, "sd");

EthernetNetIf eth(HOSTNAME);
HTTPClient http;
NTPClient ntp;
HTTPServer svr;

// Setup an analog input
AnalogIn rawtemp(p15, "temp"); // "AIN1"

// Setup Relay outputs
DigitalOut relay1(p26, "relay1"); // "PWM1"
DigitalOut relay2(p25, "relay2"); // "PWM2"

// Setup some variables for a thermostat (degress F)
float stat_heat_setpoint = 68.0;
float stat_hysteresis = 1.0;
float stat_cool_setpoint = 74.0;
float stat_current_temp = 0.0; // Will be updated from the temp sensor reading

// Make the variables RPC accessible individually
RPCVariable<float> rpc_stat_heat_setpoint(&stat_heat_setpoint, "stat_heat_setpoint");
RPCVariable<float> rpc_stat_hysteresis(&stat_hysteresis, "stat_hysteresis");
RPCVariable<float> rpc_stat_cool_setpoint(&stat_cool_setpoint, "stat_cool_setpoint");
RPCVariable<float> rpc_stat_current_temp(&stat_current_temp, "stat_current_temp");

// Make the whole state readable all at once as a JSON dict
void DoGetThermostat(char * input, char* output);
RPCFunction GetThermostat(&DoGetThermostat, "GetThermostat");

void DoGetThermostat(char * input, char* output) {
    // Input is ignored
    printf("Thermostat: %0.1f %0.1f %0.1f %0.1f\n", stat_heat_setpoint, stat_hysteresis, stat_cool_setpoint, stat_current_temp);
    printf("Relays: %d %d\n", relay1.read(), relay2.read());

    sprintf(output, "{\"hs\":%0.1f,\"hy\":%0.1f,\"cs\":%0.1f,\"ct\":%0.1f,\"rh\":%d,\"rc\":%d}",
            stat_heat_setpoint, stat_hysteresis, stat_cool_setpoint, stat_current_temp,
            relay1.read(), relay2.read());
}

// Setup the status LED
DigitalOut led1(LED1, "led1");

int main() {
    float aval;
    float res;
    int counter = 0;

    EthernetErr ethErr;
    int count = 0;
    do {
        printf("Setting up %d...\n", ++count);
        ethErr = eth.setup();
        if (ethErr) printf("Timeout\n", ethErr);
    } while (ethErr != ETH_OK);

    printf("Connected OK\n");
    const char* hwAddr = eth.getHwAddr();
    printf("HW address : %02x:%02x:%02x:%02x:%02x:%02x\n",
           hwAddr[0], hwAddr[1], hwAddr[2],
           hwAddr[3], hwAddr[4], hwAddr[5]);

    IpAddr ethIp = eth.getIp();
    printf("IP address : %d.%d.%d.%d\n", ethIp[0], ethIp[1], ethIp[2], ethIp[3]);
    printf("Check router DHCP table for name : %s\n", eth.getHostname());

    time_t ctTime;
    ctTime = time(NULL);
    printf("\nCurrent time is (UTC): %d %s\n", ctTime, ctime(&ctTime));
    printf("NTP setTime...\n");
    Host server(IpAddr(), 123, "pool.ntp.org");
    printf("Result : %d\n", ntp.setTime(server));

    ctTime = time(NULL);
    printf("\nTime is now (UTC): %d %s\n", ctTime, ctime(&ctTime));

    char ip[16];
    sprintf(ip, "%d.%d.%d.%d", ethIp[0], ethIp[1], ethIp[2], ethIp[3]);

    FSHandler::mount("/sd/www", "/"); //Mount uSD www path on web root path

    svr.addHandler<RPCHandler>("/rpc");  // Enable RPC functionality under the /rpc path
    svr.addHandler<FSHandler>("/"); // Add the file handler at the root

    svr.bind(PORT);
    printf("Server listening (port %d)\n", PORT);
    printf("- LED1 flashes server heartbeat\n");
    printf("- URL for RPC commands: %s/rpc \n", ip);

    Timer tm;
    tm.start();

    while (true) {
        Net::poll();
        if (tm.read() > 0.5) {
            tm.start();

            if (counter % 128 == 0) printf("Available memory (exact bytes) : %d\n", AvailableMemory(1));

            // Keep a loop counter
            counter++;

            // Toggle the LED
            led1 = !led1;

            // Read our rawtemp sensor and convert to degrees F
            // ref http://www.seeedstudio.com/wiki/index.php?title=Project_Seven_-_rawtemp
            // ref http://www.seeedstudio.com/wiki/index.php?title=GROVE_-_Starter_Bundle_V1.0b#rawtemp_Sensor_Twig
            aval = rawtemp.read();
            res = (10000.0 / aval) - 10000.0; // Reference resistor is 10k ohm
            stat_current_temp = (1.0 / ((log(res / 10000.0) / 3975.0) + 1 / 298.15) - 273.15) * 9.0 / 5.0 + 32.0;

            // Make sure that the setpoints don't cross
            if (stat_cool_setpoint < stat_heat_setpoint + 2 * stat_hysteresis)
                stat_cool_setpoint = stat_heat_setpoint + 2 * stat_hysteresis;

            // Update relays once every 8 loops (~ 4 seconds)
            // ref http://www.seeedstudio.com/wiki/index.php?title=Project_Five_%E2%80%93_Relay_Control
            if (counter % 8 == 0) {
                printf("Thermostat: %0.1f %0.1f %0.1f %0.1f\n", stat_heat_setpoint, stat_hysteresis, stat_cool_setpoint, stat_current_temp);

                if ((stat_current_temp < stat_heat_setpoint - stat_hysteresis) && !relay1) {
                    relay1 = 1;
                    printf("Turning Relay 1 On\n");
                }
                if ((stat_current_temp > stat_heat_setpoint + stat_hysteresis) && relay1) {
                    relay1 = 0;
                    printf("Turning Relay 1 Off\n");
                }
                if ((stat_current_temp < stat_cool_setpoint - stat_hysteresis) && relay2) {
                    relay2 = 0;
                    printf("Turning Relay 2 Off\n");
                }
                if ((stat_current_temp > stat_cool_setpoint + stat_hysteresis) && !relay2) {
                    relay2 = 1;
                    printf("Turning Relay 2 On\n");
                }
            }
        }
    }
}